WAN Fu
State Key Laboratory of Power Transmission Equipment &System Security and New Technology, Chongqing UniversityCHEN Wei-Gen
State Key Laboratory of Power Transmission Equipment &System Security and New Technology, Chongqing UniversityQI Wei
State Key Laboratory of Power Transmission Equipment &System Security and New Technology, Chongqing UniversityZOU Jing-Xin
State Key Laboratory of Power Transmission Equipment &System Security and New Technology, Chongqing UniversityGU Zhao-Liang
State Key Laboratory of Power Transmission Equipment &System Security and New Technology, Chongqing UniversityDU Ling-Ling
State Key Laboratory of Power Transmission Equipment &System Security and New Technology, Chongqing UniversityCHEN Xi
State Grid Chongqing Electrical Power Research InstituteState Key Laboratory of Power Transmission Equipment &System Security and New Technology, Chongqing University,State Key Laboratory of Power Transmission Equipment &System Security and New Technology, Chongqing University,State Key Laboratory of Power Transmission Equipment &System Security and New Technology, Chongqing University,State Key Laboratory of Power Transmission Equipment &System Security and New Technology, Chongqing University,State Key Laboratory of Power Transmission Equipment &System Security and New Technology, Chongqing University,State Key Laboratory of Power Transmission Equipment &System Security and New Technology, Chongqing University
In this paper, based on optical feedback theory and V-shaped cavity-enhanced absorption spectroscopy, combined with quantum cascade laser, a detection system for CO was built up. The optical feedback effect, even and odd modes effect, and threshold current lowering effect were studied. The effective reflectivity of 99.979% and the effective absorption path of 4.48 km in a cavity with physical length of 47 cm were obtained. By adjusting the length of V-shaped cavity automatically, the spectral resolution was improved to 0.001 1 cm-1 from 0.005 3 cm-1. With the best integration time of 53 s obtained by allan variance, this optical system allows detection for the R(6) band of CO with high accuracy of (97.79±0.07)% and the detection limit of (0.49±0.04) ppb at pressure of 40 torr and temperature of 20 °C. The effects of gas pressure on the absorption peak value, detection accuracy and detection limit for CO were also analyzed and demonstrated.
WAN Fu, CHEN Wei-Gen, QI Wei, ZOU Jing-Xin, GU Zhao-Liang, DU Ling-Ling, CHEN Xi. Detection of CO based on V-shaped cavity-enhanced absorption spectroscopy[J]. Journal of Infrared and Millimeter Waves,2015,34(6):744~749
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